text: *α-ketoglutarate + NAD + CoASH → succinyl-CoA + NADH+H + CO
  catalyzing enzyme: α-ketoglutarate dehydrogenase complex
  *succinyl-CoA + GDP + P → succinate + GTP
  catalyzing enzyme: succinyl-CoA-synthetase, EC 6.2.1.4
  *succinate + FAD → fumarate + FADH
  catalyzing enzyme: succinate dehydrogenase, EC 1.3.5.1
  *fumarate + HO → malate
  catalyzing enzyme: fumarase, EC 4.2.1.2
  *malate + NAD → oxaloacetate + NADH + H
  catalyzing enzyme: malate dehydrogenase, EC 1.1.1.37 (component of the malate aspartate shuttle)
  *oxaloacetate + acetyl-CoA + HO → citrate + CoASH
  catalyzing enzyme: citrate synthase, EC 2.3.3.1